Poll: Donald Trump still leads the GOP field

With the presidential primaries in full swing, Donald Trump maintains his sizable lead over the rest of the Republican field. Among Republican or Republican-leaning registered voters, Trump has 35% support compared to 18% for Ted Cruz and 13% for Marco Rubio, according to results from the latest NBC News|SurveyMonkey Weekly Election Tracking Poll for the week of December 28, 2015 through January 3, 2016. The poll was conducted online among a national sample of 3,700 adults aged 18 and over.

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Poll: Donald Trump still leads the GOP field

BURLINGTON, IA - OCTOBER 21: Republican presidential candidate Donald Trump greets guests after speaking at a campaign rally at Burlington Memorial Auditorium on October 21, 2015 in Burlington, Iowa. Trump leads most polls in the race for the Republican presidential nomination. (Photo by Scott Olson/Getty Images)

MOBILE, AL- AUGUST 21: Republican presidential candidate Donald Trump greets supporters after his rally at Ladd-Peebles Stadium on August 21, 2015 in Mobile, Alabama. The Trump campaign moved tonight's rally to a larger stadium to accommodate demand. (Photo by Mark Wallheiser/Getty Images)

TOPSHOT - A protester (C) is surrounded by Trump supporters as he tries to disrupt a rally for Republican presidential candidate Donald Trump on March 13, 2016 in Boca Raton, Florida. Primary voters head to the polls on March 15th in Florida. / AFP / RHONA WISE (Photo credit should read RHONA WISE/AFP/Getty Images)

MYRTLE BEACH, SC - FEBRUARY 19: Supporters wait for Republican presidential candidate Donald Trump to speak at a rally February 19, 2016 in Myrtle Beach, South Carolina. Trump is campaigning throughout South Carolina ahead of the state's primary. (Photo by Aaron P. Bernstein/Getty Images)

RICHMOND, VA - OCTOBER 14: Thousands of people line up at the Richmond International Raceway to get into a political rally with presidential candidate and Republican front-runner Donald Trump October 14, 2015 in Richmond, Virginia. A New York real estate mogul and reality television star, Trump is now in a statistical tie with retired neurosurgeon Ben Carson in a Fox News survey of likely Republican voters released Tuesday. (Photo by Chip Somodevilla/Getty Images)

Republican presidential candidate Donald Trump holds up a cap that he signed for a supporter during a rally at the Expo Hall of the Richmond International Raceway on October 14, 2015 in Richmond, Virginia. AFP PHOTO/MANDEL NGAN (Photo credit should read MANDEL NGAN/AFP/Getty Images)

RICHMOND, VA - OCTOBER 14: Supporters cheer as presidential candidate and Republican front-runner Donald Trump takes the stage during a campaign rally at the Richmond International Raceway October 14, 2015 in Richmond, Virginia. A New York real estate mogul and reality television star, Trump is now in a statistical tie with retired neurosurgeon Ben Carson in a Fox News survey of likely Republican voters released Tuesday. (Photo by Chip Somodevilla/Getty Images)

BILOXI, MS - JANUARY 02: Supporters of the Republican presidential frontrunner Donald Trump try to get autographs after his appearance at the Mississippi Coast Coliseum on January 2, 2016 in Biloxi, Mississippi. Trump, who has strong support from Southern voters, spoke to thousands in the small Mississippi city on the Gulf of Mexico. Trump continues to split the GOP establishment with his populist and controversial views on immigration, muslims and some of his recent comments on women. (Photo by Spencer Platt/Getty Images)

NORFOLK, VA - OCTOBER 31: Donald Trump supporters cheer for the Republican presidential while he speaks at a rally in front of the USS Wisconsin on October 31, 2015 in Norfolk, Virginia. . With just 93 days before the Iowa caucuses Republican hopefuls are trying to shore up support amongst the party. (Photo by Sara D. Davis/Getty Images)

NORTH CHARLESTON, SC - SEPTEMBER 23: Republican presidential candidate Donald Trump speaks before the Greater Charleston Business Alliance, which supports minority businesses and is affiliated with the South Carolina African American Chamber of Commerce on September 23, 2015 in North Charleston, South Carolina. The candidate shook hands and signed autographs after the event. (Photos by Charles Ommanney/The Washington Post via Getty Images)

NORFOLK, VA - OCTOBER 31: Republican presidential candidate Donald Trump motions to the media at a rally in front of the USS Wisconsin on October 31, 2015 in Norfolk, Virginia. . With just 93 days before the Iowa caucuses Republican hopefuls are trying to shore up support amongst the party. (Photo by Sara D. Davis/Getty Images)

BOULDER, CO - OCTOBER 28: Andy Dean, a spin room surrogate for Donald Trump, wears a hat with Trumps signature outside the spin room before Republican Presidential Debate Your Money, Your Vote sponsored by CNBC at the University of Colorado in Boulder, October 28, 2015. The event will be moderated by network anchors Carl Quintanilla and Becky Quick and chief Washington correspondent John Harwood. (Photo by RJ Sangosti/The Denver Post via Getty Images)

Supporters of Republican presidential candidate Donald Trump wave banners during a rally at the Expo Hall of the Richmond International Raceway on October 14, 2015 in Richmond, Virginia. AFP PHOTO/MANDEL NGAN (Photo credit should read MANDEL NGAN/AFP/Getty Images)

Trump supporters hold up a sign reading 'We Are The 68%' before Republican presidential hopeful Donald Trump's rally, December 14, 2015 at the Westgate Hotel & Resort in Las Vegas, Nevada. A recent USA Today poll shows 68% of Trump supporters would follow him if he left the GOP to make a third party run for the presidency. Trump will face off with Texas Sen. Ted Cruz, retired neurosurgeon Ben Carson and six other main stage candidates at tomorrow's GOP debate, hosted by CNN. AFP PHOTO / ROBYN BECK / AFP / ROBYN BECK (Photo credit should read ROBYN BECK/AFP/Getty Images)

RICHMOND, VA - OCTOBER 14: Charlotte Browning (C) and Lois Lang (2nd R) bought wigs to look like their favorite candidate, Republican front-runner Donald Trump, while lining up with thousands of others for a campaign rally at the Richmond International Raceway October 14, 2015 in Richmond, Virginia. A New York real estate mogul and reality television star, Trump is now in a statistical tie with retired neurosurgeon Ben Carson in a Fox News survey of likely Republican voters released Tuesday. (Photo by Chip Somodevilla/Getty Images)

NEW YORK, NY - SEPTEMBER 28: A supporter of Republican presidential candidate Donald Trump listens to Trump give a speech outlining his vision for tax reform at his skyscraper on Fifth Avenue on September 28, 2015 in New York City. Under the plan there would be four tax categories, with people earning less than $25,000 per year paying 0% tax. (Photo by Andrew Burton/Getty Images)

BURLINGTON, IA - OCTOBER 21: Republican presidential candidate Donald Trump greets guests after speaking at a campaign rally at Burlington Memorial Auditorium on October 21, 2015 in Burlington, Iowa. Trump leads most polls in the race for the Republican presidential nomination. (Photo by Scott Olson/Getty Images)

MOBILE, AL- AUGUST 21: Republican presidential candidate Donald Trump greets supporters after his rally at Ladd-Peebles Stadium on August 21, 2015 in Mobile, Alabama. The Trump campaign moved tonight's rally to a larger stadium to accommodate demand. (Photo by Mark Wallheiser/Getty Images)

RICHMOND, VA - OCTOBER 14: A young woman wears a Donald Trump t-shirt as thousands of people line up at the Richmond International Raceway to get into a political rally with presidential candidate and Republican front-runner Donald Trump October 14, 2015 in Richmond, Virginia. A New York real estate mogul and reality television star, Trump is now in a statistical tie with retired neurosurgeon Ben Carson in a Fox News survey of likely Republican voters released Tuesday. (Photo by Chip Somodevilla/Getty Images)

US Republican Presidential hopeful Donald Trump greets supporters as he arrives to speak during a Tea Party rally against the international nuclear agreement with Iran outside the US Capitol in Washington, DC, September 9, 2015. AFP PHOTO / SAUL LOEB (Photo credit should read SAUL LOEB/AFP/Getty Images)

LAS VEGAS, NV - DECEMBER 14: A supporter of Republican presidential candidate Donald Trump waits for the start of a campaign rally at the Westgate Las Vegas Resort & Casino on December 14, 2015 in Las Vegas, Nevada. Donlad Trump is campaigning in Las Vegas a day ahead of the final GOP debate. (Photo by Justin Sullivan/Getty Images)

Attendees try to take a photograph of Donald Trump, president and chief executive of Trump Organization Inc. and 2016 Republican presidential candidate, red cap, at the Iowa State Fair in Des Moines, Iowa, U.S., on Saturday, Aug. 15, 2015. Billionaire Republican 2016 contender Donald Trump said this week unlike rivals such as Jeb Bush, he wouldn't be beholden to big-money campaign donors if elected president. Photographer: Andrew Harrer/Bloomberg via Getty Images

GRAND RAPIDS, MI - DECEMBER 21: Jeanne Contanch (L) and Shelly Kumfer wait for the start of a campaign event with Republican presidential candidate Donald Trump on December 21, 2015 in Grand Rapids, Michigan. Trump continues to lead the most polls in the race for the Republican nomination for president. (Photo by Scott Olson/Getty Images)

PHOENIX, AZ - JULY 11: Republican Presidential candidate Donald Trump addresses supporters during a political rally at the Phoenix Convention Center on July 11, 2015 in Phoenix, Arizona. Trump spoke about illegal immigration and other topics in front of an estimated crowd of 4,200. (Photo by Charlie Leight/Getty Images)

Donald Trump, president and chief executive officer of Trump Organization Inc. and 2016 Republican presidential candidate, takes a selfie photograph with guests after an interview on Bloomberg Television's 'With All Due Respect' in the lobby of the Trump Tower in New York, U.S., on Wednesday, Aug. 26, 2015. Trump said that he agrees the carried interest tax 'loophole' should be eliminated and that it is 'tremendous burden' on country's finances. Photographer: Michael Nagle/Bloomberg via Getty Images

Attendee Lucy Weatherwax Chalmers from Palm Springs, California, places her hand over her heart during the Pledge of Allegiance at a Tea Party Patriots rally against the Iran nuclear deal on Capitol Hill in Washington, D.C., U.S., on Wednesday, Sept. 9, 2015. A revolt among U.S. House Republicans delayed action on the Iran nuclear deal today as some members insisted they aren't bound by a Sept. 17 deadline in their efforts to kill the agreement. Photographer: Andrew Harrer/Bloomberg via Getty Images

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Trump leads among men with 39% of support, compared to 21% of men who support Cruz and 13% of men who support Rubio. Trump also leads among women with 29% support, while Cruz and Rubio have about equal support from women—13% and 14%, respectively.

Perhaps surprisingly, Trump also has the highest support among white evangelical voters—33%. Although Ben Carson did fairly well among white evangelicals (12%), the group heavily favored Trump. Cruz also did well with white evangelicals, with 2 in 10 supporting him. Rubio's support among this group was 1 in 10. Republican-leaned voters who describe their political views as "very conservative" are most likely to support Trump (35%) and Cruz (30%) with the other candidates at least 20 points behind.

A big question in the election is whether Trump supporters will change their minds. Our results show that half of Trump voters (51%) say they are absolutely certain they will vote for him. Another 3 in 10 Trump supporters say there is a large chance they will vote for him. Cruz and Rubio supporters, however, are not as certain that they will vote for their candidate. Just under half (49%) of both candidates' supporters say there is a large chance they will vote for their candidate but they are not absolutely certain.